Valveless pump for conveying gases.



HOHAGEN. I YALVELESS PUMP FO'R CONVEYING GASES.

APPLICATION FILED HABJIG, 1912.

1,107,425 Y Patenteo1Aug.l8,19M

human earns earn wanna nonaenn', or cnannorrnnnuae, onnivrauv, nssrenon To I SCHUCmRT 'WERKE G. lid. H. H., 013 BERLIN, GPA-MANY, A CORPORATIQIQ F GERMANY.

specification bf Letters Patent. paaemtgfl A VALVELlBfiS PUIWIE FOR CONVEYING GASES,

in lict.

Application filed March 26, 1912. Serial No. 686,331.

My invention relates to valveless pumps for conveying gases, in which liquid for packing the movable parts is kept at a pre determined level above the delivery port. In valveless pumps which are frequently employed as gas-pumps and. particularly, as vacuum-pumps, precautions are taken for avoiding difficulties which may arise caving to large quantities of oil or other liquid which is an equivalent for the same purpose being employed for packing the moving parts A primary object of my invention is to provide improved means for obviating the difiiculties referred to. p

()ne illustrative embodiment of my invention is represented by way of example in the accompanying drawing in vertical sectionai elevation.

Referring to the drawing, the valveless pump shown is in itself of known form and comprises a casing. acontaining a cylinder 0 eccentrically journaled therein; the cylinder is provided with blades f, 7, which when the cylinder rotates are drivenradially outwhrd and inward by the wall of thus connect the suction inlet the casing and s and the delivery port d'with chambe of variable magnitude for producing tie pumping eii'ect. Valv'esare not required in such a pump. For the following reasons however, a delivery frequently been employed. Namely, above the port al oil or an equivalent liquid has been kept at a considerable level in the chamber 9* formed like an air-vessel,in order that-this oil or other liquid can constantly.

lubricate all the moving parts over which it can spread when the inner parts rotate, as clearly shown. in consequence of the oil entering into the interior of the pump from the delivery port and issuing with the conveyed gases through the same port considerable foam is produced and a number of small gas-bubbles in the oil, and if provision be not made that only oil as free from foam as" possible can pass back into the valve has nevertheless pump high degrees of vacuum cannot be ob tained, because microscopic gas-bubbles will always pass between the rubbing surfaces into the suction chamber. In order to render the oil free from foam it has heretofore been pro osed to provide in the cham ber r above t e delivery ports small antechamber containing a non-return valve through which the conveyed gas and the foamy oil issue while the clear oil which gradually settles in the outer chamber -7 passes back through fine holes in the bottom of the ante-chamber into the pump. New I have found that the oil can be rendered free from foam more simply and certainly in the manner which will now be described;

The delivery port 01 is closed by the plate having only a. few fine holes 0, and the conveyed gas and the oil mechanically carried along with it pass at a relatively high velocity .in the form of jets into the chamber r. The favorable action which is actually obtained in practice with this'simple an rahgement may be'due to the foamy oil mechanicall carried along being removed to a ronsic erable distance-from. the port on account of the considerable velocity so that the vigorous circulation of the oil thereby caused above the port causing, only 'clearfoil to pass back through the port, while the oil thrown to a distance has time 'tobecome free from foam before being circulated afresh.

It will be readily understood that the dcscribed end can also be attained by making the delivery port (I itself suihciently narrow in order to obtain the reqifi'sit-e velocity of the issuing (in account of the small changes and owing to a short port lie- 1 other reasons. the constriction b'ya plate or the like will; however, in general, be preferred. The kind and position of the small holes will depend. entirely on the circumstances of each case. When the'mdtion of the particles of oil is suing at ahigh velocity is not impeded too early the intended action can be obtained by screwing on the plate only loosely. In other cases favorable results will be obtained, say.

ing advantageous for by .inean's of small tubes or other forms of the small delivery orifices.

An essential feature of my invention is that the orifices or holes always have such a section and such a form and position that the mixture of gas and oil issues in the "form w the combination of a casing having 1% casing for is not limited to the pump described and shown but may be applied to other kinds of? wireless pumps.

1 claim 1. In a pump of the character described, a fluid suction port and a delivery port terminating in a plurality of small orifices, means in the casing for driving successive volumes of fluid through the said orifices, said means t5 being adapted to continuously decrease the volume of the space between it and said onfices, and means for submer'ging said orifices in a hai /id, said volume decreasing driving means ing adapted to drive a mixture of ill liquid and said. fluid through said orifices in the form of jets.

2. In a pump of the character described, the combination with a casing having a suction port and'a delivery port, means in the sucking a gas through the suction port and driving it through the delivery port, while continuously decreasing the volume of the space below said delivery port, and a chamber for containing a. liquid at a predetermined level above and in communication with the delivery port, of a perforated plate arranged between the said chamber and the deliveryport, said suction and driving means being adapted to ex el a mixture 3% of liquid and gas in the form oi jets through said perforated plate.

3; In a pump of the character described,

the combination with a casing provided with -means being adapted aromas an inlet port and a delivery port terminating in a plurality of relatively small orifices, means for submerging said orifices in a liquid, and pumpin I adapted to be pac edby theliquid by which said orifices are submerged, said pumping means being adapted to continuously dey crease the volume of. be space between it and said orifices to drive a mixture of said liquid and gas from said casing in the form of jets issuin from said orifices whereby bubbles of sai gas are prevented from vitiating the fluid packing of said pumping means.

l. In a pump of the character described, the combination with acasing having a suction port and a delivery port, a fluid cha n" her into which said delivery port discharges, means within said casing for pumping a gas in at the suction port and out at the delivery port, said means including a sliding member which is adapted to be packed by fluid from said fluid chamber, and a perforatedplate interposed between said delivery port and fluid chamber, said pumping to expel. a mixture of gas and fluid from said casing in the form of jets issuing from the perforations in said plate, said gas being thereby prevented from collecting; in bubbles within the casing where it vitiates the packing effects of said fluid.

In testimony whereof, I have signed my name to this specification in thepresence of two witnesses. v

WALTER Hui-menu.-

Witnesses:

Haney Hnsrns, "Wowmsan Hausa.

means within said casing 

